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An Overview on Decalepis: a Genus of Woody Medicinal Climbers

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An Overview on Decalepis: a Genus of Woody Medicinal Climbers Journal of Open Science Publications Plant Science & Research Volume 1, Issue 1 - 2014 © Anwar Shahzad 2014 www.opensciencepublications.com An Overview on Decalepis: A Genus of Woody Medicinal Climbers Research Article Shiwali Sharma and Anwar Shahzad* Plant Biotechnology Laboratory, Department of Botany, Aligarh Muslim University, Aligarh-202 002, UP, India *Corresponding author: Anwar Shahzad, Plant Biotechnology Laboratory, Department of Botany, Aligarh Muslim University, Aligarh-202 002, UP, India, E-mail: [email protected]; [email protected] Article Information: Submission: 09/01/2014; Accepted: 10/03/2014; Published: 27/03/2014 Abstract Decalepis is one of the most important endangered woody medicinal climbing members of “Periploaceace” family. It comprises five species of twining vines and erect shrubs, D. hamiltonii, D. arayalpathra, D. salicifolia, D. khasiana and D. nervosa. Four of the five species of Decalepis are endemic to the Eastern and Western Ghats of peninsular India; the exception, D. khasiana, is geographically isolated from the peninsular species, occupying forest areas in the Meghalaya state in the easternmost part of India, Bangladesh, Laos, Myanmar and parts of Southern China. D. hamiltonii is the type species and most widespread of the Indian endemics. Three species (D. arayalpathra, D. hamiltonii and D. salicifolia) have clusters of numerous fleshy and tuberous roots with a sweet, vanilla-like fragrance due to the presence of 2-hydroxy-4-methoxy benzaldehyde (2H4MB). The tuberous roots of D. arayalpathra and D. salicifolia are moniliform, while those of D. hamiltonii are cylindrical. The roots of D. khasiana are documented as being non-tuberous, and fragrant due to an isomer of vanillin. Four of the five species ofDecalepis (all except D. nervosa) are utilized in tribal and traditional Indian and Chinese medicine for the treatment of a wide range of ailments including those of the digestive system, lungs and circulatory system. Presently the three peninsular Indian species of Decalepis are threatened in the wild, and listed as endangered (D. hamiltonii) to critically endangered (D. arayalpathra and D. salicifolia) due to over-exploitation and habitat loss. During last few years considerable efforts have been tried to conserve this valuable endangered liana using different strategies of plant tissue culture viz., in vitro shoot regeneration (direct or indirect) and root induction, somatic embryogenesis, hydrogel encapsulation, normal root culture and hairy root culture. The present review provides up-to-date baseline information of all the species of this valuable endangered and endemic medicinal genus for further research work. Keywords: D. hamiltonii; D. arayalpathra; D. salicifolia; D. khasiana; D. nervosa Abbreviations Introduction BA: N-6-Benzyladenine; 13C NMR: Carbon 13 NMR; IAA: Indole- India is one of the 17 megadiversity countries and has all the 13 3-Acetic Acid; IUCN: The International Union for Conservation biomes found in the world, with 3 major hotspots out of a total of 34 [1]. It has been reputed to be a treasure house of a wide range of of Nature and Natural Resources; GA3: Gibberellic Acid; GC: Gas valuable medicinal and aromatic plants on account of habitant of Chromatography; GC-MS: Gas Chromatography Mass Spectroscopy; divers’ climatic conditions. India harbours about 47,000 species of 2H4MB: 2-Hydroxy-4-Methoxy Benzaldehyde; 2-iP: 2-Isopentyl plants of which 17,000 are angiosperms [1]. The International Union Adenine; Kn: Kinetin; NAA: α-Naphthalene Acetic Acid; PAA: Phenyl for Conservation of Nature and Natural Resources (IUCN) Red List 1 Acetic Acid; PG: Phloroglucinol; H NMR: Proton NMR; AgNO3: of Threatened species include a total of 560 species from India, out of Silver Nitrate; TDZ: Thidiazuron; TLC: Thin Layer Chromatography; which 247 species are in the Threatened category. On a global basis, the TRIA: Triacontanol; Zea: Zeatin IUCN has estimated that about 12.5% of the world’s vascular plants, 01 ISSN: 2349-2805 JOURNAL OF PLANT SCIENCE & RESEARCH Anwar Shahzad totalling about 34,000 species are under varying degree of threat [2]. of only 20 km due to windfall patterns and topography, resulting in However, according to the report of Hamilton [3] an estimated 4,000 the development of small ecological islands with unique floras on the to 10,000 species of medicinal plants face potential local, regional, borders of wet evergreen and dry evergreen and deciduous forests [9]. national or global extinction, with subsequent serious consequences D. nervosa, the northernmost of these narrowly endemic species, for livelihoods, economies and health care systems. is restricted to one of the highest sections of the Western Ghats, Decalepis is one of the most important endangered woody the Nilgiris (Blue Mountains in Tamil), which occupy the western medicinal climbers. This review is aimed at compiling up-to-date corner of Tamil Nadu where it borders Karnataka and Kerala states. information regarding medicinal and economical properties or D. nervosa has been documented at an elevation of ca. 1500 to 2300 related information of all the species of Decalepis over its range of m, on rocky hillsides and exposed areas of deciduous forests near distribution, current status and the role of biotechnology in the Coonoor, Kothagiri, and Wellington. The Nilgiris are geographically conservation of this important genus. isolated from the neighboring mountains to the south by the 32-42 km wide Palghat gap, a low pass in the Western Ghats [4]. Distribution D. salicifolia and D. arayalpathra occupy similar habitats in hilly Decalepis belongs to the family Periploaceace (an offshoot of and mountainous areas to the south of Palghat gap. D. salicifolia has the Asclepiadaceae). It comprises five species of twining vines/erect been documented in three localities, the Anamalai Hills (Kerala and shrubs; Tamil Nadu), Nelliampathy (Kerala) and Marayoor (Kerala) forests. • D. hamiltonii (the type species) The Anamalai Hills (Elephant hills in Tamil Nadu) straddle Kerala and Tamil Nadu states just south of Palghat gap and are known for their • D. arayalpathra abundant wildlife and under consideration by the UNESCO World • D. khasiana Heritage Committee for selection as a World Heritage Site. Further south, D. arayalpathra occupies rocky hill slopes on the Agasthiyar • D. nervosa hills (Kerala) and within Kalakkadu Mandanthurai tiger reserve in • D. salicifolia Tamil Nadu [4]. Four of the five species of Decalepis are endemic to the Eastern D. khasiana was first described from a specimen collected at an and Western Ghats of peninsular India; the exception, D. khasiana, altitude of 900-1200 m, in the Khasia hills in Eastern India. It has is geographically isolated from the peninsular species, occupying since been documented in Laos, on the Tran-Ninh plateau in the area forest areas in the Meghalaya state in the easternmost part of India, of Xieng-Khowang, at an altitude of 800-900 m [10], in the Tamabil- Bangladesh, Laos, Myanmar, and parts of southern China. All five Jaflong hills of the Sylhet district in Bangladesh, and in the Yunnan, species occur in hilly to montane regions, in elevations ranging from Guizhou, and Sicuan provinces of China, in bush land forests and in 100-1200 meters [4]. Myanmar [4]. D. hamiltonii is the type species and most widespread of the Taxonomic History Indian endemics. It is locally called as “Maredukommulu” or The taxonomic history of Decalepis began with the naming of “Nannarikommulu” or “Barresugnadhi” or “Maredugaddalu” D. hamiltonii by Robert Wight and George Arnott Walker-Arnott or “Madinakommulu” in Telugu, “Makaliber” in Kannada, in Wight’s “Contributions to the Botany of India” (1834), based on a “Magalikizhangu” in Tamil and “Swallow root” in English. It grows in specimen collected by Wight in Madras, India [11]. Walker-Arnott, open rocky slopes and crevices of dry and moist deciduous forests of who was collaborating with Wight, upon observing what he referred Karnataka (Hassan, Mysore, Bellary, Tumkur, Kolar), Andhra Pradesh to as “a double row of scales” (referred to in this study as “corona (Kurnool, Chittoor, Nellore, Anantapur, Cuddapah districts) and in lobes” and “interstaminal nectaries”), placed the new species in its Tamil Nadu (Chengalpattu, Coimbatore, Dharampuri, Nilgiri) at an own genus, Decalepis (Greek deca=ten, lepis =scale) [11]. Wight altitude from 300-1200 meters [5]. Though relatively widespread, its mistakenly referred to the specimen in an earlier, unpublished populations are fragmented and gradually declining due to destructive version of his manuscript as being from the herbarium of the Scottish harvesting of the tuberous roots [6]. physician and botanist Francis Hamilton; Walker-Arnott chose to The remaining peninsular species, D. arayalpathra, D. salicifolia honor Hamilton with the specific epithet hamiltonii despite the fact that the specimen was from the Madras Herbarium and not from and D. nervosa, have more restricted distributions, each occupying a Hamilton’s collection [4]. different mountain range in the southern part of the Western Ghats. The south Western Ghats (bordered to the north by the Kalindi river) Decalepis was monotypic until Venter and Verhoeven [12] are extremely diverse floristically, comprising the richest center of synonymized the monotypic Indian genera Baeolepis Decne. ex endemism in peninsular India, with almost 1200 endemic species Moq. and Janakia J. Joseph & V. Chandras. with Decalepis, followed [7,8]. Subramanyan and Nayar [9] compared this assemblage of in 2001 by Utleria Bedd. ex. Benth. & Hook. f., also monotypic hilltops, bounded to the west by the coastal plain and by the semi- and endemic to India, on the basis of “ovate-like corona lobes, an arid Deccan plain to the east, to an island chain in respect to the obconical style-head with flat apex containing translator hollows, distribution of endemic species. In the Western Ghats, the length of and pollen in pollinia” [12,13]. Results of phylogenetic analysis the dry season can range from three to eight months over a distance (excepting D. nervosa, for which molecular data were unavailable) Citation: Sharma S, Shahzad A.
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